ARCA Branderi. 
TAB. CCLXXVI. — Figs. 1 and 2. 
Spec. Char. Transversely elongated,, rhombic, 
gibbose, finely decussated ; beaks distant ; 
longitudinal striae strongest ; teeth numerous ; 
edge internally entire. 
Above twice as wide as long : the hinge line is long 
and straight, terminated at each end hy an angle that 
almost forms an ear : from the beak proceeds an obtuse 
ridge towards the front of the longer side ; the space be- 
tween the beaks is plain except three or four impressed 
striae, which are nearer perpendicular than usual. 
I have seen several specimens of this Arc from Barton 
Cliff, but cannot refer it to any species before described, 
nor do I think it has been found in France. The shell 
represented at fig. 2, is in the Wood wardian collection 
at Cambridge, the other was given me by Miss Bea- 
minster ; it is by no means common ; I have named it in 
commemoration of Brander, whose exquisite plates of 
Hampshire fossils will ever be admired. 
ARCA appendiculata. 
TAB. CCLXXVI.— Fig. 3. 
Spec. Char. Transversely elongated, rhombic, 
gibbose, decussated ; beaks rather distant ; 
two oblong appendages upon the space be- 
tween the beaks ; edge toothed within. 
Strongly resembling the last, but wider; the longitudi- 
nal ridges are not deeply cut hy the lines of growth, they 
